tree 60affb5bdc5b857dfb3969234659caedbf2ff02a
parent 64970b68d2b3ed32b964b0b30b1b98518fde388e
author Alexander van Heukelum <heukelum@mailshack.com> 1205582682 +0100
committer Ingo Molnar <mingo@elte.hu> 1209230476 +0200

x86: merge the simple bitops and move them to bitops.h

Some of those can be written in such a way that the same
inline assembly can be used to generate both 32 bit and
64 bit code.

For ffs and fls, x86_64 unconditionally used the cmov
instruction and i386 unconditionally used a conditional
branch over a mov instruction. In the current patch I
chose to select the version based on the availability
of the cmov instruction instead. A small detail here is
that x86_64 did not previously set CONFIG_X86_CMOV=y.

Improved comments for ffs, ffz, fls and variations.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>